Suction line is losing prime would be my guess. This is usually caused by the hose that goes from the steel line to the pump along the left side frame rail. A pretty big PITA to get to and stay clean doing it, but other than being messy, it's a straight forward removal. You can try to loosen a pressure line slightly and see if that helps it prime, just be very careful of the fluid. There is also a doughnut type gasket and a cork gasket down on the sump pan under the tractor (directly under the cab) that could be leaking, but usually it's the hose that gets a small split that allows air in and the fluid to drain back down, and thus, causing the pump to lose its prime.
Hurst
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